Bearing- and drive arrangement of a rotary piston internal combustion engine

Abstract

A bearing arrangement and drive transmission arrangement of a rotary piston internal combustion engine having trochoidal-shaped casing mantle raceway surfacing and having a triangular piston controlled by a synchronous drive transmission consisting of a hollow gear and a pinion, with which the teeth of the hollow gear are machined or worked out of a piston bore extending over the entire width by impact pushing/cutting and broaching. A further bore is concentrically provided in the piston bore and extends from a side remote from the synchronous drive transmission as far as to the hollow gear and of which teeth only tooth butt ends are left standing upon which a bearing sleeve of the eccentric bearing is pressed thereon. Cooling passages or channels result between the bearing sleeve and the tooth butt ends. Transfer of contact heat from the piston onto the eccentric bearing is considerably reduced by engagement of the bearing sleeve only upon the tooth butt ends.

What I claim is: 
     
       1. A bearing- and transmission drive arrangement of a rotary piston internal combustion engine having a housing consisting of two side parts and a casing mantle part with a dual-arc trochoidal-shaped casing mantle inner raceway surfacing as well as having an eccentric shaft that passes axially through the housing and that is journalled by the two side parts as well as including an eccentric upon the eccentric shaft upon which a triangular piston controlled by a synchronous transmission drive means has corners of the triangular piston sliding with continuous engagement along the casing mantle raceway inner surfacing and with which the synchronous drive transmission means consists of a hollow gear fixed stationary on the piston and a pinion fixed stationary in a side part and located concentrically around the eccentric shaft, the improvement comprising: a tooth means of the hollow gear worked out of a bearing bore; a further bore means provided concentrically in the bearing bore extending from a side of the piston remote from the synchronous drive transmission means as far as to a hollow gear; said tooth means having a diameter located between tooth tips and tooth bases so that tooth butt ends remain; and a bearing sleeve 15 inserted upon the tooth butt ends so that passages result between the bearing sleeve, the tooth butt ends and the tooth bases.   
     
     
       2. An arrangement according to claim 1, in which said further bore means is provided prior to said tooth means being worked out. 
     
     
       3. An arrangement according to claim 1, in which said tooth butt ends have a height in a range between half the height and up to two thirds of the height of the tooth means of the hollow gear. 
     
     
       4. An arrangement according to claim 1, in which said tooth means of the hollow gear is worked out by impact/cutting thereof. 
     
     
       5. An arrangement according to claim 1, in which a spring-snap ring means secures said bearing sleeve against axial shifting and displacement on a side thereof remote from the synchronous drive transmission means. 
     
     
       6. An arrangement according to claim 5, in which tongue means are provided for fastening of the spring-snap ring engaging with an edge thereof against the tooth butt ends in location of corners of said piston. 
     
     
       7. An arrangement according to claim 5, in which a continuous rotary groove is provided in said further bore and into which said spring-snap ring is pressed and on an edge having teeth oriented in alignment with the passages.